Heating-drum.



No. 668,332. r vPaltaantmi Feb. I9, |9v0l. A. JOHNSTON.

HEATING DRUM. (Application med oct. 4. 19041.

lo Rodel.)

t il!!! ABNER JOHNSTON, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TOGEORGE It. JOHNSTON, OF SAME PLACE.

HEATING-DRUM.

SPECIFICATION forming' part 0f Letters Patent No. 668,332, datedFebruary 19, 1901. Application iiled October 24, 1900. Serial No.34,151. (No model.)

T0 a/ZZ whom it nfl/tty con/cern..

Be it known that I, ABNER JOHNSTON, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Heating-Dru ms; andI do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed drawings,making a part of this specification, and to the letters of referencemarked thereon. Y

The present invention has reference to that class of heating-drumsadapted for connection with a stove, furnace, or other heat-generatingdevice for utilizing the escaping products of combustion as a medium forheating the air as it passes through the ues of the drum.

It is the object of the invention to provide a drum with air-fines ofsuch form and so disposed on an incline that the greatest possibleheating-surface will be present-ed to the air as it passes up and out ofthe Iiues into the room to be heated, thereby materially facilitatingthe heating of the escaping air and furnishing a heating-drum ofsuperior construction and effectiveness.

The invention consists in aheating-drum constructed substantially asshown in the drawings and hereinafter described and claimed.

Figure l of the drawings is a perspective view of a heating-drumconstructed in accordance with my invention; Fig. 2, a' 'centralvertical section showing in dotted lines where the pipes or otherconduits for the passage of the products are connected; Fig. 3, ahorizontal sect-ion taken on line 3 3 of Fig. 2 looking in the directionof the arrows.

In the accompanying drawings, A represents the drum, of any suitablelength and diameter and provided at its bottom and top with openingshaving collars a b for connecting thereto in any preferred manner thepipes or tubes for conducting off the products of combustion from thestove or other heat-generating device.

I do not wish to be understood as limiting my invention to anyparticular means of connecting the dr'um with the pipes or otherconduits of the heat-generating device, as the same may be connected tothe sides of the drum instead of at the bottom and top, as shown in Fig.2 of the drawings.

The air-flues B O are Hat or straight sided, extending across the drum,as shown in Fig. l and 3 of the drawings, and disposed on an incline, asindicated in Fig. 2 of the drawings.

Having the air-fines B O flat-sided increases the area of theheating-surface without the necessity of a multiplication of tubes, theforms of the flues herein shown being rectangular in cross-section andof such width as to allow a space c between it and the wall of the drumfor the products of combustion to circulate around the fines to heat theair as it passes up the same. The iues are disposed on an incline, asshown in Fig. 2 of the drawings, thereby gaining a greater length offlue and again increasing the area of heating-surface, the essentialfeature of the invention being to obtain as great an area of heatingsurface with the least number of iiues, and thereby materiallysimplifying the construction of the heating-drum and enabling it to bemanufactured at a greatly-reduced cost, besides renderingitseffectiveness in heating the escaping air more effective. It will benoticed that the iues are so disposed with relation to each other thatthe spaces c for the passage of the products of combustion are at theopposite sides of the drum., as shown in Fig. 3 of the drawings, therebyallowing passage of a perfect circulation of the heating product aroundthe flues, and thereby more quickly and satisfactorily heating the airpassing through the same.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is

A heating-drum and rectangular or flatsided air-dues therefor, saidflues being dis-.-

posed on an incline and only partly across the drum to form passages forth'e circulation of the products of combustion at the opposite ABNERJOHNSTON.

Witnesses:

J AMES L. McEwnN, C. W. LIND.

